Shaft coupling



Feb. 28, 1928.

c. A. HIRTH SHAFT COUPLING Filed Sept. 27. 1926 2 Sheets-Sheet l i @I g 2 CZ i 2;

Feb. 2s, 192s. I l1,660,792

C. A. HlR-TH SHAFT COUPLING Filed Sept. 27. 1926 2 Sheets-She'et 2 wil' munl

multim Patented eb. 28, i928.

` retain Unirse strates Parser elseif-ea@ CARL ALBERT BIRTH, or noivivnnnoRistori-Tianaioniinsnn, GERMANY.

, SHAFT coUPLING.

Application filed September 27, 1926, Serial No.i138,052, and in Germany December 23, 1.924..

My invent-ion relates to shaft couplings, more especially of the kind comprising symmetrical serrations with teethA the faces of which are inclined to theaxis of the shafts and the crest and root lines of which are arranged radially to the axis of the shafts:

, It is an object of my invention to provide `a coupling of the kind described devoid of allintermediate parts, the ends of the shafts engaging directly so that they are coupled more accurately and with higher efliciency.

In the drawings aiiixed -to this specification and forming part thereof lSeveral cout Yplings embodying my invention arelillustrated diagrammatically by vway of example.

In the drawings Figs. l, 2, 3, and 5 a-i'e partly `sectional elevations illustrating shafts of equal diam eter, coupled together, while Fig. 4 is a similar view showing coupled f shafts of different diameters.A v

Figure 6 is a partial sectional view through theshaft coupling showing a slight Vmodification in the coupling means.

In all figures, a and b are the shafts and c are the serrations. Y

Referring first to Figs. l, 2, 3, and 5, identical serrations c are machined or otherwise made Ain the'ends of the shafts to vbe coupled. The faces of each tooth converge toward the axis of the shaft and the crests and the roots of the serrations are arranged t on conical faces which intersect in the axis of the shafts. With good workmanship the contact of such a coupling is excellent and at the same time the shafts are centered duev to the wedge-like shape of the teeth.

Except in the modification illustrated in Fig. 4 the ends of the shafts are provided with split rings d inserted in grooves near the ends of the shaft. Y

In the inodication illustrated in Fig. l, flanges e are placed over the rings and axial thrust is exerted on these anges by screws f. d1ny number of such screws may be pro-` vi -e VScrews require a comparatively largeV diameter of the flanges,l and in order toover- Y come this drawback, the screws can bev replaced by a threaded sleeve g as shownfin Fig. 2 which` engages opposite threadsat skilled in the art.

the inner ends of two rings' e', e2 which 'y are placed over the rings d.

A similar construction is shownin Fig. 6 but here onlyone ring d vis provided in a groove of the shaft I), the other ring being replaced by a threaded ring e3 engaging a groove in the shaft a on which ring caissecured a sleeve et which engages behind the ringd. This' construction vdispenses with a separate sleeve g and with the necessity of providing opposite threads on the sleeves e andreal as iii Fig. 2.

A form in whichopposite threads arev also i eliminated is shown1 in Fig. 3. It substan-y tially resembles-the forni shown in F ig..f6 but the inner sleeve e5, instead of being ii`it serted in a' grooveof the shaft a, engages,y

placed over the split rings cl in both shafts and are connected with any desired number l. Obviously constructionsl as described with reference to the other figures may also be provided.

vof screws as described with reference to Fig.

I wish i'tvto be understood thatI do not v I desire tobe limited to the exact details Aof construction shown and described for ob"- vious rmodifications will occur to a person I claim l. A shaft couplingcomprisinga pair of shaft sections having central recesses in their meeting ends and provided at their periphtending endwise from the shaft sections for interfitting engagement when the shaft sec'- tions are brought togethen'saidV teeth constructed with their inner faces converging and the roots and crests of the teeth prov viding elements of cones lwhose vertices lie in a common point onthe axis 'of each/shaft section.

2. A shaft coupling comprising a paired.:l shaft sections of like construction adapted to abut at their ends, each shaft section having 90 eral portions with annular series of'teeth eX-M a central opening in its` end and an annular series of teetliaboutV the opening and extendinglengthwse of the shaft section, the Y teeth having conveniggingl faces andl having i 5 their roots and crests comprisnof elements o' Cones Whose vertices lie on `tl'e axis of the shaft section, and means for adju'stably CARL ALBERT HIRTH. 

